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authorStephen Warren <swarren@nvidia.com>2012-03-02 13:05:44 -0700
committerLinus Walleij <linus.walleij@linaro.org>2012-03-05 11:19:49 +0100
commit57b676f9c1b7cd84397fe5a86c9bd2788ac4bd32 (patch)
treee07d87bba28678aa80d9325a9c48eac0f57a7fe2 /drivers/pinctrl/pinconf.c
parent962bcbc57aa244eeb1176fa2e9f65ac865cca68a (diff)
pinctrl: fix and simplify locking
There are many problems with the current pinctrl locking: struct pinctrl_dev's gpio_ranges_lock isn't effective; pinctrl_match_gpio_range() only holds this lock while searching for a gpio range, but the found range is return and manipulated after releading the lock. This could allow pinctrl_remove_gpio_range() for that range while it is in use, and the caller may very well delete the range after removing it, causing pinctrl code to touch the now-free range object. Solving this requires the introduction of a higher-level lock, at least a lock per pin controller, which both gpio range registration and pinctrl_get()/put() will acquire. There is missing locking on HW programming; pin controllers may pack the configuration for different pins/groups/config options/... into one register, and hence have to read-modify-write the register. This needs to be protected, but currently isn't. Related, a future change will add a "complete" op to the pin controller drivers, the idea being that each state's programming will be programmed into the pinctrl driver followed by the "complete" call, which may e.g. flush a register cache to HW. For this to work, it must not be possible to interleave the pinctrl driver calls for different devices. As above, solving this requires the introduction of a higher-level lock, at least a lock per pin controller, which will be held for the duration of any pinctrl_enable()/disable() call. However, each pinctrl mapping table entry may affect a different pin controller if necessary. Hence, with a per-pin-controller lock, almost any pinctrl API may need to acquire multiple locks, one per controller. To avoid deadlock, these would need to be acquired in the same order in all cases. This is extremely difficult to implement in the case of pinctrl_get(), which doesn't know which pin controllers to lock until it has parsed the entire mapping table, since it contains somewhat arbitrary data. The simplest solution here is to introduce a single lock that covers all pin controllers at once. This will be acquired by all pinctrl APIs. This then makes struct pinctrl's mutex irrelevant, since that single lock will always be held whenever this mutex is currently held. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/pinconf.c')
-rw-r--r--drivers/pinctrl/pinconf.c107
1 files changed, 79 insertions, 28 deletions
diff --git a/drivers/pinctrl/pinconf.c b/drivers/pinctrl/pinconf.c
index 3f018a1cc14..e0a453790a4 100644
--- a/drivers/pinctrl/pinconf.c
+++ b/drivers/pinctrl/pinconf.c
@@ -64,15 +64,23 @@ int pin_config_get(const char *dev_name, const char *name,
struct pinctrl_dev *pctldev;
int pin;
+ mutex_lock(&pinctrl_mutex);
+
pctldev = get_pinctrl_dev_from_devname(dev_name);
- if (!pctldev)
- return -EINVAL;
+ if (!pctldev) {
+ pin = -EINVAL;
+ goto unlock;
+ }
pin = pin_get_from_name(pctldev, name);
if (pin < 0)
- return pin;
+ goto unlock;
- return pin_config_get_for_pin(pctldev, pin, config);
+ pin = pin_config_get_for_pin(pctldev, pin, config);
+
+unlock:
+ mutex_unlock(&pinctrl_mutex);
+ return pin;
}
EXPORT_SYMBOL(pin_config_get);
@@ -110,17 +118,27 @@ int pin_config_set(const char *dev_name, const char *name,
unsigned long config)
{
struct pinctrl_dev *pctldev;
- int pin;
+ int pin, ret;
+
+ mutex_lock(&pinctrl_mutex);
pctldev = get_pinctrl_dev_from_devname(dev_name);
- if (!pctldev)
- return -EINVAL;
+ if (!pctldev) {
+ ret = -EINVAL;
+ goto unlock;
+ }
pin = pin_get_from_name(pctldev, name);
- if (pin < 0)
- return pin;
+ if (pin < 0) {
+ ret = pin;
+ goto unlock;
+ }
+
+ ret = pin_config_set_for_pin(pctldev, pin, config);
- return pin_config_set_for_pin(pctldev, pin, config);
+unlock:
+ mutex_unlock(&pinctrl_mutex);
+ return ret;
}
EXPORT_SYMBOL(pin_config_set);
@@ -129,25 +147,36 @@ int pin_config_group_get(const char *dev_name, const char *pin_group,
{
struct pinctrl_dev *pctldev;
const struct pinconf_ops *ops;
- int selector;
+ int selector, ret;
+
+ mutex_lock(&pinctrl_mutex);
pctldev = get_pinctrl_dev_from_devname(dev_name);
- if (!pctldev)
- return -EINVAL;
+ if (!pctldev) {
+ ret = -EINVAL;
+ goto unlock;
+ }
ops = pctldev->desc->confops;
if (!ops || !ops->pin_config_group_get) {
dev_err(pctldev->dev, "cannot get configuration for pin "
"group, missing group config get function in "
"driver\n");
- return -EINVAL;
+ ret = -EINVAL;
+ goto unlock;
}
selector = pinctrl_get_group_selector(pctldev, pin_group);
- if (selector < 0)
- return selector;
+ if (selector < 0) {
+ ret = selector;
+ goto unlock;
+ }
- return ops->pin_config_group_get(pctldev, selector, config);
+ ret = ops->pin_config_group_get(pctldev, selector, config);
+
+unlock:
+ mutex_unlock(&pinctrl_mutex);
+ return ret;
}
EXPORT_SYMBOL(pin_config_group_get);
@@ -163,27 +192,34 @@ int pin_config_group_set(const char *dev_name, const char *pin_group,
int ret;
int i;
+ mutex_lock(&pinctrl_mutex);
+
pctldev = get_pinctrl_dev_from_devname(dev_name);
- if (!pctldev)
- return -EINVAL;
+ if (!pctldev) {
+ ret = -EINVAL;
+ goto unlock;
+ }
ops = pctldev->desc->confops;
pctlops = pctldev->desc->pctlops;
if (!ops || (!ops->pin_config_group_set && !ops->pin_config_set)) {
dev_err(pctldev->dev, "cannot configure pin group, missing "
"config function in driver\n");
- return -EINVAL;
+ ret = -EINVAL;
+ goto unlock;
}
selector = pinctrl_get_group_selector(pctldev, pin_group);
- if (selector < 0)
- return selector;
+ if (selector < 0) {
+ ret = selector;
+ goto unlock;
+ }
ret = pctlops->get_group_pins(pctldev, selector, &pins, &num_pins);
if (ret) {
dev_err(pctldev->dev, "cannot configure pin group, error "
"getting pins\n");
- return ret;
+ goto unlock;
}
/*
@@ -197,23 +233,30 @@ int pin_config_group_set(const char *dev_name, const char *pin_group,
* pin-by-pin as well, it returns -EAGAIN.
*/
if (ret != -EAGAIN)
- return ret;
+ goto unlock;
}
/*
* If the controller cannot handle entire groups, we configure each pin
* individually.
*/
- if (!ops->pin_config_set)
- return 0;
+ if (!ops->pin_config_set) {
+ ret = 0;
+ goto unlock;
+ }
for (i = 0; i < num_pins; i++) {
ret = ops->pin_config_set(pctldev, pins[i], config);
if (ret < 0)
- return ret;
+ goto unlock;
}
- return 0;
+ ret = 0;
+
+unlock:
+ mutex_unlock(&pinctrl_mutex);
+
+ return ret;
}
EXPORT_SYMBOL(pin_config_group_set);
@@ -236,6 +279,8 @@ static int pinconf_pins_show(struct seq_file *s, void *what)
seq_puts(s, "Pin config settings per pin\n");
seq_puts(s, "Format: pin (name): pinmux setting array\n");
+ mutex_lock(&pinctrl_mutex);
+
/* The pin number can be retrived from the pin controller descriptor */
for (i = 0; i < pctldev->desc->npins; i++) {
struct pin_desc *desc;
@@ -254,6 +299,8 @@ static int pinconf_pins_show(struct seq_file *s, void *what)
seq_printf(s, "\n");
}
+ mutex_unlock(&pinctrl_mutex);
+
return 0;
}
@@ -280,6 +327,8 @@ static int pinconf_groups_show(struct seq_file *s, void *what)
seq_puts(s, "Pin config settings per pin group\n");
seq_puts(s, "Format: group (name): pinmux setting array\n");
+ mutex_lock(&pinctrl_mutex);
+
while (pctlops->list_groups(pctldev, selector) >= 0) {
const char *gname = pctlops->get_group_name(pctldev, selector);
@@ -290,6 +339,8 @@ static int pinconf_groups_show(struct seq_file *s, void *what)
selector++;
}
+ mutex_unlock(&pinctrl_mutex);
+
return 0;
}